Which of the following describes the state of the respiratory system when the lung volume is at Functional Residual Capacity (FRC)?
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Correct answer: Lung inward recoil balances outward chest wall recoil
At FRC, which occurs at the end of a quiet expiration, the inward elastic recoil of the lungs and the outward elastic recoil of the chest wall are equal and opposite. This balance point establishes the resting equilibrium volume of the respiratory system.
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